Many moons ago i had a noisy alternator which would wer through my cb radio. I fitted a snap toghether Ferite Choke Core to the main lead before entering the radio and wella the noise was gone.

Thinking of this using my v3 inside the house with heaps of EMI bounding around and interfering with the detector .So got a snap on core choke and fitted it to the coil lead just before the cable enters the box and immediately all the EMI had gone.

If we look around today some USB leads have them fitted just before they enter a camera.

The name comes from Blocking- Choking high frequencies while passing Low frequencies.

Minelab sd-gp are very prone to EMI in built up areas . It just makes them impossible to use on some days. The ferrite choke does not shield the electronis but stops the interferrence getting into the control box.

It will not do any damage to the circuit board. So the next thing is to to throw one on to a GPX on the beach and see how it handles the EMI. We will see how it goes .

I know nothing about sparky things , my son gave me a JAYCAR catalog and I saw those , the idea had occurred to me also , only interference I get is from thunder storms if I haven't done a noise cancel on the EXTERRA ,I just use that as a warning to go home .

I remember reading a post on a US forum by some very knowlagable PI users in regards this & I found it interesting, my sea hunter suffers from EMI on some beaches + in effects the depth on the ctx also.lazy

Great idea, my Plasma telly came with 2 chokes that can be opened and clicked on around a cable. I never used them.. Might chuck one on my 305 just for the heck of it.. Could it cancel out any faint signals that you may want to dig?

I think they are std issue for the minelab gold detectors in Usa. I thought they would be to help output noise rather than input ? If someone is talking to Kevin in Mlb service they might remember to ask.

CP, when I wrote that I was running the XT70 and went looking around town for the ferrite chokes but could not readily find one. DSE no longer stocks electronic components, Jaycar didn't have any so I left it.

The ExplorerSE is doing well for me but as usual always looking for an edge. I have the opportunity to pick up a hardly used Sunray Stealth x-12 coil at around half retail price delivered which apparently is better than the stock coil that came with the SE (the SE pro had a better coil again, apparently the only noticeable difference between the SE and the SE Pro). I don't know what difference (if any) the choke would make on the Explorer. If I come across one I'll try it just for giggles but wont be going out of my way to find one to test.

If I was in the market I'd probably still get a 3030 simply for the multiple target display and better timings but would prefer 'more reliable' waterproof qualities hence a bit of an interest in the Excalibur down the track to complement the current set up. Either way I'll have to find some more gold I think before that happens unless I can manage to find a benefactor.